PLATHIO 



THE TERMS USJE3> IN COIfCHOLOGY. 



I . SYMETRICAL UNIVALVE S . 



SERIAL MtJLTIVALVES . 



I. 



Cbit,on 



'COttOKAL MULTIVAiVE S- 



dersal vaJrt- 



fd art a 



Coronula . _ 



Iblycipes 

 I LAMPLIKBr SHELLS 



'N. Tfa forte of the- varutu* shdls faat'uw the- sam*- nutnber or I*****- are sitn 



